Potter OS&Y Gate Valve Supervisory Switch

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The OSYSU is used to monitor the open position of an OS&Y (outside screw and yoke) type gate valve.
Brand: Potter
Part Number: OSYSU-1

Availability: This product has been discontinued.




General Information
The OSYSU is used to monitor the open position of an OS&Y (outside screw and yoke) type gate valve. The OSYSU-1, contains one set of SPDT (Form C) contacts. These switches mount conveniently to most OS&Y valves ranging in size from 2" to 12" (50mm to 300mm). They will mount on some valves as small as ½" (12,5mm).

The cover is held in place by two tamper resistant screws that require a special tool to remove. The tool is furnished with each device and should be left with the building owner or responsible party. Replacement or additional cover screws and hex keys are available. See Ordering Information.

Optional Cover Tamper Switch
A field installable cover tamper switch is available as an option which may be used to indicate removal of the cover.

The OSYSU and its associated protective monitoring system should be inspected and tested in accordance with applicable NFPA codes and standards and/or the authority having jurisdiction (manufacturer recommends quarterly or more frequently).

Additional Info

Additional Info

Part Number OSYSU-1
What's in the box (1) Potter OS&Y Gate Valve Supervisory Switch
Variant N/A


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Model OSYSU-1
Description Outside Screw & Yoke Supervisory Switch (Single switch)
Dimensions 6.19"L X 2.25"W X 5.88"H
15,7cm L X 5,7cm W X 14,6cm H
Weight 2 lbs (0,9 kg)
Enclosure Cover - Die-Cast
Finish - Red Spatter Enamel
Base - Die Cast Zinc
All parts have corrosion resistant finishes
Cover Tamper Tamper Resistant Screws
Optional Cover Tamper Switch Available
Contact Ratings OSYSU-1: One set of SPDT (Form C)
OSYSU-2: Two sets of SPDT (Form C)
15 Amps at 125/250VAC
2.5 Amps at 30VDC resistive
Environmental Limitations -40°F to 140°F (-40°C to 60°C)
NEMA 4 and NEMA 6P Enclosure (IP67)
Indoor or outdoor use (Not for use in hazardous locations. See
Bulletin No. 5400705 OSYS-U-EX for hazardous locations).
Conduit Entrances 2 knockouts for 1/2" conduit provided
Service Use NFPA-13 Automatic Sprinkler
NFPA-13D One or two family dwelling
NFPA-13R Residential occupancy up to four stories
NFPA-72 National Fire Alarm Code